something though did change around 2014 in montreal as far as cartel influence. from the el chapo trial we learned that alex cifuentes was arrested in mexico nov 2013, deported to colombia dec 2014. at some point between these dates he agreed to cooperate against el chapo. with this arrest and cooperation cifuentes could not have been relied upon for exports to canada. el chapo as we know was arrested feb 22 2014 and imprisoned in mexico. perhaps the guzman faction of sinaloa cartel was not able to satisfy cocaine needs any longer and passed this on to another faction in cartel. or perhaps the new jalisco/los cuinis cartel took advantage of the vacuum in montreal.
there was a radio canada story about the fact that abigail gonzalaez valencia, head of los cuinis and bro-in-law to cartel boss nemesio, had been seen at an apartment in montreal several times in 2014. valencia had been traveling internationally with a fake passport. as alluded to in radio canada article he likely was not in montreal on vacation. i could not find any specific dates as to when valencia was in montreal but very coincidental i think. there was also mention in a lapresse article concerning the arrest and sentence of another cartel member segio almaraz-martin for cocaine possession i think. martin plead guilty 2017 after investigation found trafficking was being done to a ceramique/marble business in montreal.
all to say with the sinaloa cartel connect starting to fall apart for many reasons circa 2012 first in ontario then into quebec you can see the possibility of a rival moving in to take over. i think this is the case in regards to montreal.